Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

Code 10 NEUTRAL CONDUCTOR PROTECTIVE
DEVICES, ISOLATORS AND SWITCHES
10A Linked Circuit Breakers, Linked Isolators and Linked
Switches
(a) Any linked circuit breaker, linked switch or linked isolator with switched
neutral should be arranged to have the neutral pole contact open after
the phase pole contacts and should close before or at the same time as
the phase pole contacts.
(b) No fuse, circuit breaker, isolator or switch, other than a linked circuit
breaker, linked isolator or linked switch, should be inserted in a neutral
conductor.
10B Protection of Neutral Conductor
A single pole switch should be inserted in the phase conductor of a single
phase circuit only. No fuse, circuit breaker, isolator or switch, other than a
linked circuit breaker, linked isolator or linked switch should be inserted in a
neutral conductor.
10C Single-pole Switch in Earthing Conductor
Notwithstanding Code 10B, a single-pole switch may be inserted between the
earthing connection and the neutral terminals of generators running or likely
to be running in parallel if it is recommended by the manufacturer and
adequate precautions have been taken to avoid danger.
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